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Q400 > APU > Flashcards

APU Flashcards

1
Q

APU model and type of engine?

A

Gas turbine engine
APS 1000

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2
Q

Purposes of APU?

A

On ground for DC power and bleed air

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3
Q

What controls the APU and monitors it?

A

FADEC
Full authority digital control

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4
Q

APU gets power to start from?

A

R main DC bus

Main battery, Aux battery or DC external power

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5
Q

Is the APU fire detection and protection system automatic or manual?

A

Auto

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6
Q

How does the APU receive fuel?

A

Gravity fed fuel pump maintains positive fuel pressure

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7
Q

How much fuel does the APU burn per hour?

A

100kg per hour

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8
Q

APU fuel valve closes when?

A
  1. POWER SWITCH LIGHT PRESSED OFF
  2. FIRE TEST BUTTON PRESSED ON
  3. FADE DETECTS APU
    AUTOMATICALLY SHUT DOWN DUE TO A FAULT
  4. FIRE IS DETECTED IN THE TAILCONE
  5. AIRCRAFT BECOMES AIRBORNE
  6. ILLUMINATION OF GENERATOR
    OVERHEAT LIGHT
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9
Q

Where is the APU compressor air inlet?

A

Top right side of the tailcone

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10
Q

Two APU air inlets used for and located?

A

Compartment ventilation and starter generator cooling.
Located at the bottom forward edge of the tailcone

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11
Q

APU starter/ generator electrical output?

A

28V DC and 400 ampere

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12
Q

How is the APU Gen cooled?

A

Air cooled

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13
Q

How long will the ‘starter’ button stay illuminated when starting the APU?

A

Until reaching 50% speed

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14
Q

When does the RUN light illuminate?

A

> 95% speed

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15
Q

When does the WARN light illuminate?

A

When the generator does not supply power with the APU operating

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16
Q

With the green GEN light ON what is happening?

A

The APU DC generator is supplying power to the DC buses

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17
Q

APU loads can be seen?

A

On the electrical page on the MFD

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18
Q

The Main DC bus loads show what with the APU running?

A

The APU starter generator output

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19
Q

APU GEN load on the MFD shows?

A

The load as a percentage.
1.00 = 100%
.50 = 50 % load

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20
Q

If the APU is on and DC external power is applied, which one powers the buses?

A

The DC external power

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21
Q

Starter generator fault detected what will you see?

A

Green ON light extinguishes
Amber WARN light illuminates
APU caution light illuminates

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22
Q

Starter generator overheat what indications will you see?

A

GEN OHT illuminates
WARN illuminates
APU caution light
APU shuts down automatically

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23
Q

How long after APU start (green run light illuminated) can you press bleed air?

A

20 seconds

24
Q

What do check valves do?

A

Prevent engine air from flowing into the APU
And prevent bleed air from flowing into either engine

25
Q

1 or 2 BLEED HOT caution light

A

Air duct hot or duct leak

26
Q

When APU fire is detected what will you see?

A
  • A red FIRE advisory light on the APU FPP.
  • The red Master
    Warning light and the amber Master Caution light flashes on the glareshield.
  • The CHECK FIRE DET warning flashes red.
  • The amber BTL ARM advisory light
    illuminates on the FPP.
  • The white APU FUEL CLOSED light
    illuminates on the FPP, and the green
    APU FUEL OPEN advisory light extinguishes.
  • The white APU EXTG switchlight illuminates on the Fpp
  • the amber APU caution light illuminates on the
    CAUTION/WARNING panel
27
Q

When to manually discharge during APU fire?

A

When BTL ARM and APU fire advisory light remain illuminated for 7 seconds

28
Q

APU fire bottle type?

A

Halon 1301

29
Q

Will the BTL LOW amber light on APU fire protection panel cause the master wanting light?

A

Yes mater warning CHECK FIRE DET

30
Q

Will the APU automatically shut down if there is a fire?

A

Yes

31
Q

What will you see if the FADEC shuts down the APU?

A

Amber FAIL light
APU FUEL VALVE closed
FUEL VALVE open green light is off
APU caution light

32
Q

APU temp limits?

A

Not below -35
Not above the lower of 50 degrees or ISA +35

33
Q

APU starter limits?

A

60 seconds start attempt
Wait 5 mins
If APU doesn’t start on second attempt maintenance is required
30 mins from last attempt after maintenance

34
Q

Illumination of the WARN segment of the GEN switchlight can indicate ?

A

(All of the above)
Gen not selected on
APU shutdown automatically
GCU detects GEN fault

35
Q

On the APU fire protection panel the amber FAULT annunciator indicates there is a fault with ?

A

The fire detection loop

36
Q

Indications of an APU bleed duct leak are ?

A

The #1 and #2 BLEED HOT caution lights illuminating

37
Q

Indications that the APU starter is engaged include ?

A

The STARTER segment of the START switchlight illuminating

38
Q

The APU generates rated power above what operating speed?

A

95%

39
Q

An APU GEN LOAD of [.49] on the ELECTRICAL system page indicates a load of approximately ?

A

196 amperes

40
Q

The APU generator supplies power directly to ?

A

The right MAIN DC bus

41
Q

The APU is mounted ?

A

In the tailcone

42
Q

When pushing the PWR switchlight on the APU control panel, each switchlight segment illuminating indicates ?

A

A self test is in progress

43
Q

APU fuel shut-off valve position can be verified ?

A

On the Fire Protection Panel

44
Q

The fire detection system for the APU utilises ?

A

A sensor tube filled with an inert gas

45
Q

The APU starter remains engaged until the APU has reached what speed?

A

50%

46
Q

If an APU fire test is performed while the APU is running ?

A

The APU will shut down

47
Q

Vhen APU exhaust gas temperature is approaching the limit, to reduce load ?

A

The generator has priority - bleed air flow is automatically modulated to stay within EGT limits

48
Q

Which of the following will not result in an APU auto shutdown?

A

Low oil temperature

49
Q

When a fire is detected in the APU compartment an automatic shutdown occurs followed by ?

A

The extinguishing agent discharging after 7 seconds

50
Q

Per QantasLink policy the APU must not be operated ?

A

Unless a pilot or engineer is in attendance

51
Q

During gravity refuelling operations the APU ?

A

Must not be operated

52
Q

The lower and upper temperature limitations for APU operation are ?

A

-35 and +50 degrees C or ISA +35 degrees C, whichever is lower

53
Q

APU fire detection and protection is available ?

A

Whenever the DC essential bus is powered

54
Q

The extinguishing agent for an APU fire is supplied from ?

A

A dedicated bottle in the aft equipment bay

55
Q

In addition to supplying bleed air to the Environmental Control System (ECS), the APU bleed also supplies air to ?

A

The aft safety valve to hold it open

56
Q

The purpose of the APU check valve is to ?

A

Prevent engine bleed air from flowing in to the APU

Q400 (22 decks)

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